#include <cstdio>
#include <cufft.h>
#include <cmath>
#include <cuda_runtime.h>
#include <iostream>
#include <memory>
#include <vector>
#include <cmath>
#include <complex>
#include <device_launch_parameters.h>
#include <cuda_runtime.h>
#include <cublas_v2.h>
#include <cuComplex.h>
#include <cufft.h>
#include <cufftw.h>
#include <cufftXt.h>
#include <cublas_v2.h>
#include <cuComplex.h>
#include "BaseConstVariable.h"
#include "GPUTool.cuh"
#include "GPUBPTool.cuh"
#include "BPBasic0_CUDA.cuh"
#include "GPUBpSimulation.cuh"
#include "GPURFPC.cuh"



double* getFreqPoints_mallocHost(double startFreq, double endFreq, long freqpoints)
{
	long double dfreq = (endFreq - startFreq) / (freqpoints - 1);
	double* freqlist = (double*)mallocCUDAHost(sizeof(double) * freqpoints);
	for (long i = 0; i < freqpoints; i++) {
		freqlist[i] = startFreq + dfreq * i;
	}
	return freqlist;
}

cuComplex* createEchoPhase_mallocHost(long Np, long Nf)
{
	cuComplex* phdata = (cuComplex*)mallocCUDAHost(sizeof(cuComplex) * Np * Nf);
	for (long i = 0; i < Np; i++) {
		for (long j = 0; j < Nf; j++) {
			phdata[i * Nf + j] = make_cuComplex(0, 0);
		}
	}
	return phdata;
}


__global__ void kernel_RFPCProcess(
	double* Sx,double* Sy,double* Sz,
	double Tx, double Ty,double Tz,
	double Tslx,double Tsly,double Tslz, // 目标的坡面向量
	double p1,double p2,  double p3,  double p4,  double p5,  double p6,
	long Np,long Nf,
	double minF,double dFreq,double RefRange,
	cuComplex* phdata
) {
	long prfid = blockIdx.x * blockDim.x + threadIdx.x; // 获取当前的线程编码
	if (prfid >= Np || prfid < 0) { return; }
	else {}

	// 距离
	Vector3 S{ Sx[prfid],Sy[prfid],Sz[prfid] };
	Vector3 T{ Tx,Ty,Tz };
	Vector3 slp{ Tslx,Tsly,Tslz };
	//printf("S=(%e,%e,%e)\n", S.x, S.y, S.z);
	// 入射角
	Vector3 TS = vec_sub(S, T);//T-->S
	double localIncAngle = angleBetweenVectors(TS, slp, false);// 入射角
	double sigma0 = GPU_getSigma0dB(p1, p2, p3, p4, p5, p6, localIncAngle);// 后向散射系数
	sigma0 = powf(10.0, sigma0 / 10.0);

	// 距离
	double R = sqrt(vec_dot(TS, TS));

	// 计算增益
	double amp_echo = sigma0 / (powf(4 * LAMP_CUDA_PI, 2) * powf(R, 4)); // 反射强度
	double phi = 0;
	for (long fid = 0; fid < Nf; fid++) {
		phi = -4.0 * PI / LIGHTSPEED * (minF + dFreq * fid) * (R - RefRange);
		phdata[prfid * Nf + fid].x += amp_echo * cos(phi);
		phdata[prfid * Nf + fid].y += amp_echo * sin(phi);
		//printf("phdata(%d,%d)=complex(%e,%e)\n", prfid, fid, phdata[prfid * Nf + fid].x, phdata[prfid * Nf + fid].y);
	}
	//printf("Nf:%d\n", Nf);
	//printf("amp_echo:%f\n", amp_echo);
	//printf("sigma0:%f\n", sigma0);
	//printf("R:%e\n", R);
}


void RFPCProcess(double Tx, double Ty, double Tz,
	double Tslx, double Tsly, double Tslz, // 目标的坡面向量
	double p1, double p2, double p3, double p4, double p5, double p6, 
	GPUDATA& d_data)
{


	double* AntX = (double*)mallocCUDADevice(sizeof(double) * d_data.Np);
	double* AntY = (double*)mallocCUDADevice(sizeof(double) * d_data.Np);
	double* AntZ = (double*)mallocCUDADevice(sizeof(double) * d_data.Np);

	HostToDevice(d_data.AntX, AntX, sizeof(double) * d_data.Np); printf("antX host to device finished!!\n");
	HostToDevice(d_data.AntY, AntY, sizeof(double) * d_data.Np); printf("antY host to device finished!!\n");
	HostToDevice(d_data.AntZ, AntZ, sizeof(double) * d_data.Np); printf("antZ host to device finished!!\n");
	double minF = d_data.minF[0];
	long grid_size = (d_data.Np + BLOCK_SIZE - 1) / BLOCK_SIZE;
	double dfreq = d_data.deltaF;
	double R0 = d_data.R0;
	kernel_RFPCProcess<<<grid_size , BLOCK_SIZE >>>(
		AntX, AntY, AntZ,
		Tx, Ty, Tz,
		Tslx, Tsly, Tslz, // 目标的坡面向量
		p1, p2, p3, p4, p5, p6,
		d_data.Np, d_data.Nfft,
		minF, dfreq,R0,
		d_data.phdata
	);

	PrintLasterError("RFPCProcess");
	FreeCUDADevice(AntX);
	FreeCUDADevice(AntY);
	FreeCUDADevice(AntZ);

	return ;
}